I hate to compare anyone with McCarthy, but there ARE a few interesting
stylistic parallels:

1) McCarthy made public allegations about people against whom nothing had been
proven. So did Garrison.

2) McCarthy would often refer to secret evidence which proved him right. So did
Garrison.

3) McCarthy attacked those who disagreed with him a being a part of the
conspiracy. So did Garrison.

4) McCarthy made charges that, in retrospect, do not seem supported by the
evidence. So did Garrison.

5) McCarthy had a smarmy self-assuredness that HE was right and everbody else
was wrong. Only HE carried the absolute truth in his hip pocket. Garrison could
often be that way.

6) McCarthy would always believe the most conspiratorial interpretation of some
event or piece of evidence, when a more innocent explanation would suffice. So
did Garrison.

I'm not saying that I think either man was insincere. I think they both
eclipsed over a threshhold of belief and lost their ability to see things
objectively. Once you cross that threshhold, anything is possible.